update blog from another blog with script

Hello, I am trying to figure out how to post a blog on one site and have it update or sync with my wordpress blog. I have been searching and reading, but have not found what I was looking for. I am not sure I am wording it right or something. I am thinking maybe with a little js this can be accomplished, and I am still learning it, so if anyone has a idea of a good place for me to start, or to find what I am looking for I would greatly appreciate it.